Gaspé
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Gaspé clear sky chart from 2005-11-06 to 2024-11-03.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	17% 11% 3 8% 5% 5% 5% 4 6% 7% 31%	101792
	Night	17% 11% 3 8% 5% 5% 4 4 5% 6% 31%	97291
Transparency	Day	51% 8% 14% 18% 8% 1	101534
	Night	52% 9% 12% 18% 8% 1	97169
Seeing	Day	23% 17% 29% 21% 8% 2	16648
	Night	24% 15% 27% 24% 10% 1	24062

By Month

Percentage Cloud Cover NE (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	13% 14% 4 11% 8% 6% 6% 5% 7% 8% 19%	2207
	11th to 20th	Day	9% 12% 5% 11% 6% 7% 6% 6% 8% 9% 22%	2210
	21st to end	Day	6% 8% 3 13% 6% 10% 5% 4 7% 8% 30%	2800
February	1st to 10th	Day	9% 13% 4 10% 7% 5% 5% 5% 5% 7% 30%	1710
	11th to 20th	Day	10% 17% 4 11% 8% 4 3 3 5% 6% 27%	1663
	21st to end	Day	9% 12% 5% 10% 7% 5% 5% 4 5% 6% 32%	1413
March	1st to 10th	Day	14% 13% 4 9% 5% 5% 5% 4 4 6% 31%	3322
	11th to 20th	Day	17% 23% 6% 11% 5% 5% 3 3 4 6% 17%	3480
	21st to end	Day	22% 16% 5% 8% 4 4 3 3 4 5% 28%	3816
April	1st to 10th	Day	18% 14% 4 9% 6% 4 4 3 5% 5% 27%	2280
	11th to 20th	Day	17% 13% 4 6% 5% 4 4 3 5% 6% 32%	2432
	21st to end	Day	22% 12% 4 7% 4 4 4 3 4 6% 29%	2470
May	1st to 10th	Day	24% 14% 4 8% 5% 3 4 3 5% 6% 24%	4388
	11th to 20th	Day	14% 10% 3 7% 5% 4 4 4 5% 7% 38%	4398
	21st to end	Day	21% 12% 3 8% 5% 5% 5% 4 5% 6% 26%	5081
June	1st to 10th	Day	23% 10% 3 7% 4 4 4 4 5% 5% 30%	2850
	11th to 20th	Day	19% 8% 2 6% 5% 4 3 4 6% 8% 35%	2850
	21st to end	Day	25% 10% 3 7% 5% 4 5% 4 6% 6% 26%	2850
July	1st to 10th	Day	15% 6% 2 6% 5% 5% 5% 4 7% 8% 37%	4760
	11th to 20th	Day	12% 7% 2 7% 6% 6% 6% 5% 8% 8% 33%	4760
	21st to end	Day	13% 6% 2 6% 5% 5% 5% 4 6% 8% 40%	4987
August	1st to 10th	Day	16% 7% 3 7% 5% 5% 5% 5% 7% 8% 31%	4218
	11th to 20th	Day	16% 6% 3 7% 5% 5% 6% 5% 7% 9% 31%	4045
	21st to end	Day	13% 5% 2 5% 4 4 4 3 5% 8% 46%	4481
September	1st to 10th	Day	20% 5% 3 6% 5% 4 3 4 6% 6% 39%	2280
	11th to 20th	Day	20% 6% 2 5% 4 3 3 3 4 5% 44%	2200
	21st to end	Day	19% 7% 2 5% 5% 5% 5% 3 5% 7% 37%	2038
October	1st to 10th	Day	16% 7% 3 6% 5% 5% 4 4 6% 6% 37%	1900
	11th to 20th	Day	22% 11% 3 8% 5% 3 3 3 5% 6% 30%	1900
	21st to end	Day	24% 12% 4 6% 4 4 5% 3 4 7% 27%	1933
November	1st to 10th	Day	17% 13% 3 9% 5% 6% 5% 3 5% 7% 27%	1501
	11th to 20th	Day	19% 13% 6% 9% 6% 6% 6% 3 4 6% 23%	1520
	21st to end	Day	19% 15% 5% 11% 6% 5% 4 3 5% 5% 22%	1520
December	1st to 10th	Day	18% 14% 5% 12% 6% 4 5% 4 5% 6% 21%	1430
	11th to 20th	Day	13% 15% 6% 13% 10% 6% 6% 3 6% 6% 17%	1668
	21st to end	Day	15% 13% 4 14% 6% 5% 6% 5% 5% 5% 22%	2431
January	1st to 10th	Night	9% 12% 5% 15% 9% 7% 5% 5% 6% 7% 18%	4748
	11th to 20th	Night	15% 13% 4 9% 6% 5% 5% 5% 7% 7% 23%	4760
	21st to end	Night	6% 9% 4 10% 6% 9% 5% 4 7% 8% 32%	4846
February	1st to 10th	Night	10% 14% 4 9% 6% 5% 5% 4 6% 6% 33%	2470
	11th to 20th	Night	13% 15% 5% 10% 6% 5% 4 4 5% 6% 27%	2403
	21st to end	Night	11% 14% 4 7% 6% 5% 5% 4 6% 6% 32%	2041
March	1st to 10th	Night	11% 13% 4 8% 7% 6% 5% 4 5% 7% 32%	3515
	11th to 20th	Night	21% 20% 5% 10% 5% 4 5% 3 4 4 20%	3479
	21st to end	Night	26% 13% 3 7% 4 4 3 3 4 6% 28%	3816
April	1st to 10th	Night	22% 12% 3 8% 5% 4 5% 4 5% 7% 26%	1900
	11th to 20th	Night	20% 10% 3 7% 4 4 4 3 5% 6% 34%	1695
	21st to end	Night	23% 11% 4 7% 4 3 3 3 5% 5% 34%	1710
May	1st to 10th	Night	24% 11% 3 7% 5% 6% 4 3 4 5% 27%	2561
	11th to 20th	Night	14% 8% 3 5% 4 4 4 4 6% 8% 40%	2506
	21st to end	Night	15% 10% 5% 10% 6% 5% 5% 4 6% 7% 27%	2532
June	1st to 10th	Night	24% 8% 2 7% 4 4 4 3 6% 6% 31%	1330
	11th to 20th	Night	19% 7% 2 7% 5% 4 4 3 5% 7% 37%	1330
	21st to end	Night	22% 7% 3 7% 4 5% 5% 5% 6% 6% 30%	1330
July	1st to 10th	Night	14% 7% 2 6% 4 4 4 4 6% 7% 42%	2210
	11th to 20th	Night	13% 6% 2 6% 5% 3 5% 5% 6% 9% 40%	2210
	21st to end	Night	11% 5% 2 6% 4 4 4 4 6% 8% 47%	2546
August	1st to 10th	Night	14% 8% 2 7% 5% 5% 5% 4 5% 6% 38%	2700
	11th to 20th	Night	14% 6% 2 6% 4 4 5% 4 6% 9% 39%	2782
	21st to end	Night	14% 6% 2 5% 4 3 3 4 5% 7% 47%	3174
September	1st to 10th	Night	18% 6% 2 5% 4 4 4 3 5% 6% 43%	1900
	11th to 20th	Night	18% 6% 2 5% 3 4 3 3 5% 5% 46%	1976
	21st to end	Night	19% 7% 2 5% 4 4 4 2 4 6% 44%	2142
October	1st to 10th	Night	19% 7% 3 6% 4 4 4 3 5% 6% 40%	2280
	11th to 20th	Night	22% 10% 2 7% 4 4 4 4 4 6% 34%	2280
	21st to end	Night	21% 10% 3 6% 4 4 4 3 5% 7% 33%	2661
November	1st to 10th	Night	20% 12% 3 7% 5% 4 4 4 4 5% 32%	2622
	11th to 20th	Night	20% 13% 5% 9% 5% 4 4 4 6% 7% 24%	2660
	21st to end	Night	20% 15% 5% 12% 5% 4 4 4 5% 5% 21%	2660
December	1st to 10th	Night	19% 14% 4 10% 6% 5% 5% 4 6% 6% 20%	2749
	11th to 20th	Night	18% 17% 5% 10% 7% 5% 5% 4 5% 5% 19%	3531
	21st to end	Night	18% 13% 5% 15% 7% 5% 5% 3 5% 5% 20%	5236

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	55% 21% 11% 10% 3	2208
	11th to 20th	Day	51% 12% 16% 15% 6%	2210
	21st to end	Day	47% 10% 17% 16% 9% 1	2800
February	1st to 10th	Day	50% 8% 12% 18% 10% 2	1710
	11th to 20th	Day	57% 7% 11% 16% 8%	1671
	21st to end	Day	51% 8% 8% 22% 9% 2	1413
March	1st to 10th	Day	52% 9% 15% 17% 7% 1	3326
	11th to 20th	Day	66% 8% 8% 10% 6% 1	3480
	21st to end	Day	59% 5% 11% 16% 7% 2	3816
April	1st to 10th	Day	57% 6% 9% 15% 12% 1	2280
	11th to 20th	Day	51% 6% 10% 19% 12% 1	2432
	21st to end	Day	54% 7% 13% 14% 11% 1	2470
May	1st to 10th	Day	59% 7% 11% 16% 6% 1	4403
	11th to 20th	Day	44% 7% 17% 23% 8% 1	4402
	21st to end	Day	53% 9% 13% 17% 8% 1	5081
June	1st to 10th	Day	53% 8% 12% 17% 9% 1	2850
	11th to 20th	Day	46% 7% 14% 21% 10% 1	2850
	21st to end	Day	56% 8% 12% 16% 7%	2850
July	1st to 10th	Day	42% 8% 15% 24% 10%	4685
	11th to 20th	Day	45% 8% 19% 22% 7%	4679
	21st to end	Day	40% 9% 20% 22% 10%	4828
August	1st to 10th	Day	47% 9% 20% 20% 5%	4204
	11th to 20th	Day	45% 9% 20% 20% 5% 1	4084
	21st to end	Day	35% 6% 17% 28% 12% 1	4481
September	1st to 10th	Day	43% 8% 16% 23% 10%	2280
	11th to 20th	Day	43% 6% 15% 27% 9%	2200
	21st to end	Day	46% 7% 12% 24% 10% 1	2038
October	1st to 10th	Day	44% 8% 15% 23% 8% 2	1900
	11th to 20th	Day	54% 6% 15% 19% 5% 1	1900
	21st to end	Day	57% 7% 11% 16% 7% 1	1933
November	1st to 10th	Day	57% 7% 13% 14% 9%	1501
	11th to 20th	Day	61% 6% 14% 13% 6%	1520
	21st to end	Day	64% 8% 12% 11% 6%	1520
December	1st to 10th	Day	63% 10% 11% 11% 4	1430
	11th to 20th	Day	67% 9% 10% 10% 4	1668
	21st to end	Day	59% 13% 12% 11% 3 1	2431
January	1st to 10th	Night	60% 15% 11% 10% 3	4748
	11th to 20th	Night	55% 13% 11% 14% 7%	4760
	21st to end	Night	45% 15% 14% 14% 9% 3	4846
February	1st to 10th	Night	52% 6% 10% 18% 12% 2	2470
	11th to 20th	Night	57% 8% 8% 17% 9%	2406
	21st to end	Night	51% 6% 9% 22% 12% 1	2041
March	1st to 10th	Night	52% 8% 10% 21% 9% 1	3524
	11th to 20th	Night	66% 6% 8% 13% 6% 1	3480
	21st to end	Night	58% 4 10% 16% 10% 2	3816
April	1st to 10th	Night	56% 7% 11% 13% 13% 1	1900
	11th to 20th	Night	51% 5% 9% 23% 11% 1	1695
	21st to end	Night	52% 5% 10% 15% 15% 2	1710
May	1st to 10th	Night	55% 10% 10% 16% 8% 1	2566
	11th to 20th	Night	41% 9% 14% 27% 9%	2507
	21st to end	Night	51% 10% 12% 18% 8% 1	2533
June	1st to 10th	Night	52% 7% 12% 18% 10%	1330
	11th to 20th	Night	47% 7% 14% 18% 14% 1	1330
	21st to end	Night	52% 9% 12% 19% 7% 1	1330
July	1st to 10th	Night	41% 7% 16% 21% 14%	2175
	11th to 20th	Night	41% 7% 18% 29% 5%	2168
	21st to end	Night	35% 10% 22% 23% 11%	2465
August	1st to 10th	Night	47% 7% 17% 22% 7%	2689
	11th to 20th	Night	41% 8% 20% 23% 6%	2809
	21st to end	Night	35% 8% 16% 29% 13%	3173
September	1st to 10th	Night	42% 8% 13% 27% 10% 1	1900
	11th to 20th	Night	41% 6% 14% 27% 12%	1976
	21st to end	Night	41% 6% 12% 27% 13% 1	2142
October	1st to 10th	Night	45% 7% 13% 24% 10% 1	2280
	11th to 20th	Night	51% 7% 13% 21% 7%	2280
	21st to end	Night	52% 7% 13% 20% 7% 1	2661
November	1st to 10th	Night	53% 8% 14% 17% 7% 1	2622
	11th to 20th	Night	58% 8% 13% 15% 5% 1	2660
	21st to end	Night	64% 9% 12% 10% 4	2660
December	1st to 10th	Night	64% 11% 10% 12% 3	2749
	11th to 20th	Night	67% 8% 8% 13% 4	3532
	21st to end	Night	65% 9% 13% 11% 3	5236

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	34% 15% 29% 19% 2 1	180
	11th to 20th	Day	32% 21% 29% 12% 6% 1	180
	21st to end	Day	17% 23% 31% 21% 7% 2	307
February	1st to 10th	Day	23% 22% 31% 15% 8% 1	370
	11th to 20th	Day	20% 26% 33% 17% 4 1	366
	21st to end	Day	17% 21% 33% 22% 6% 1	307
March	1st to 10th	Day	20% 24% 35% 15% 5% 1	445
	11th to 20th	Day	21% 22% 29% 21% 6% 1	460
	21st to end	Day	29% 22% 29% 15% 4 2	506
April	1st to 10th	Day	30% 26% 25% 15% 3 1	460
	11th to 20th	Day	26% 19% 33% 16% 5% 2	452
	21st to end	Day	26% 19% 26% 22% 5% 2	460
May	1st to 10th	Day	29% 14% 28% 20% 7% 2	629
	11th to 20th	Day	24% 15% 27% 22% 10% 3	674
	21st to end	Day	26% 21% 30% 18% 5% 1	735
June	1st to 10th	Day	28% 15% 28% 20% 8% 2	680
	11th to 20th	Day	22% 12% 28% 24% 11% 2	680
	21st to end	Day	26% 11% 31% 21% 10% 1	680
July	1st to 10th	Day	18% 8% 35% 27% 10% 2	670
	11th to 20th	Day	13% 11% 33% 29% 12% 2	668
	21st to end	Day	18% 9% 24% 33% 13% 3	740
August	1st to 10th	Day	18% 7% 26% 31% 17% 2	560
	11th to 20th	Day	16% 6% 32% 27% 15% 3	479
	21st to end	Day	16% 12% 31% 27% 11% 3	539
September	1st to 10th	Day	20% 14% 35% 20% 9% 2	490
	11th to 20th	Day	24% 17% 28% 20% 9% 3	490
	21st to end	Day	23% 21% 28% 19% 8% 1	463
October	1st to 10th	Day	17% 21% 28% 21% 9% 3	390
	11th to 20th	Day	27% 20% 26% 17% 7% 2	390
	21st to end	Day	29% 20% 28% 16% 7% 1	429
November	1st to 10th	Day	28% 20% 26% 19% 5% 1	371
	11th to 20th	Day	28% 21% 28% 15% 6% 2	370
	21st to end	Day	32% 21% 29% 17% 2	370
December	1st to 10th	Day	25% 16% 36% 19% 4 1	280
	11th to 20th	Day	31% 26% 28% 12% 3 1	180
	21st to end	Day	25% 28% 30% 12% 4 1	198
January	1st to 10th	Night	24% 19% 31% 19% 6% 1	850
	11th to 20th	Night	23% 20% 31% 21% 5%	850
	21st to end	Night	19% 19% 32% 22% 8% 1	876
February	1st to 10th	Night	20% 18% 31% 24% 6% 1	760
	11th to 20th	Night	25% 16% 34% 19% 5% 1	743
	21st to end	Night	19% 19% 29% 21% 9% 2	628
March	1st to 10th	Night	21% 18% 31% 22% 7% 1	760
	11th to 20th	Night	23% 18% 29% 21% 8% 1	760
	21st to end	Night	28% 16% 26% 21% 8% 1	836
April	1st to 10th	Night	30% 13% 29% 21% 7% 1	570
	11th to 20th	Night	25% 12% 30% 23% 9% 1	564
	21st to end	Night	29% 10% 26% 24% 9% 1	570
May	1st to 10th	Night	28% 8% 21% 29% 12% 2	570
	11th to 20th	Night	22% 9% 24% 28% 15% 2	562
	21st to end	Night	20% 13% 28% 30% 8% 1	490
June	1st to 10th	Night	28% 7% 22% 28% 14% 1	380
	11th to 20th	Night	24% 7% 21% 31% 15% 3	380
	21st to end	Night	23% 5% 21% 34% 15% 1	380
July	1st to 10th	Night	18% 5% 18% 39% 18% 2	370
	11th to 20th	Night	19% 6% 18% 38% 18% 1	368
	21st to end	Night	16% 6% 20% 37% 19% 2	497
August	1st to 10th	Night	19% 4 16% 40% 19% 1	568
	11th to 20th	Night	19% 3 20% 34% 22% 1	562
	21st to end	Night	17% 6% 24% 31% 20% 2	627
September	1st to 10th	Night	21% 10% 26% 29% 13% 1	570
	11th to 20th	Night	21% 10% 25% 28% 15% 1	646
	21st to end	Night	23% 11% 28% 27% 11% 1	760
October	1st to 10th	Night	22% 16% 26% 24% 11% 1	760
	11th to 20th	Night	26% 17% 23% 23% 10% 1	760
	21st to end	Night	26% 16% 27% 23% 8%	869
November	1st to 10th	Night	28% 18% 27% 21% 6% 1	841
	11th to 20th	Night	29% 18% 29% 17% 6% 2	850
	21st to end	Night	29% 21% 27% 18% 4 1	850
December	1st to 10th	Night	29% 18% 32% 15% 5% 1	850
	11th to 20th	Night	28% 25% 28% 14% 4	850
	21st to end	Night	28% 20% 27% 19% 5% 1	935

Page generated at 2024-10-31 03:39:23. Version ac07

Copyright © 2024 Attilla Danko.